Apparatus for shaping glassware



A ii 1927.

pr 19 R'. w. cANFzELD APPARATUS FUR SHAPING GLASSWARE Filed June 26. 1926 Patented Apr-i 19, 1927.

UNITED s'ra'rns PATENT or ROBERT W. CANFIELD. OF WEST HARTFORD, CONNECTICUT, ASSIGNOR T6 HARTFORD- EMPIRE COMPANY, OF HARTFORD, CONNECTICUT, A CORPORATION OF DELA- WARE.

AIPABATUS FOR SHAPING GLASSWARE.

Application filed June 26, 1926. Serial No. 118,743.

This invention relates to apparatus for Another object of my present invention is 55 shaping glassware, and has particular relato provide a suitable holder for the carbon tion 7 to pressing apparatus for. shaping blank mold, equipped with means for preblanks for electric lamp bulbs and other venting the inner edges of the molding .3 paste-mold glassware, such as the apparatus cavity from chipping or otherwise becomdisclosed in my copcnding application for ing deformed so as to mar the blanks or Letters Patent, Serial No. 31,315, filed May produce peripheral fins upon them.

19, 1925, of which the present application In the accompanying drawings:

is a continuation in part. Figure l is a vertical sectional view 10 This application is concerned particularly through a combined blowhead and pressing with the blank mold and its associated plunger andits cooperating press mold, both pressing plunger, and the principal object of these elements being provided with carof the present invention is to improve the hon inserts according to the invention; and surface quality of the blanks and the dis- Fig. 2 is a bottom plan view of the carbon tribution and quality of the finished ware. insertor tip of'the pressingplunger.

When blanks for past-mold glassware are Referring to the drawing, a press mold 70 forn'ied in iron molds, as has been customary for lamp bulb blanks is illustrated as comheretofore, a relatively thick skin or enamel prising an outer metallic cylindrical shell 1 is produced on the outer surfaces of the which is supported in any suitable manner 20 blanks, probably because of the high heatand which is provided with a flange 2 at its conductivity of the metal molds, and this inner. lower edge, which constitutes a. seat T5 skin, although removed somewhat by refor a brush-carbon insert 3 having a mold heating, persists to a greater or less extent cavity 4 formed therein. The insert 3 is in the finished article. T he skin often rupprevented from becoming displaced from turcs irregularly and produces noticeable the shell 1 by means of a metallic retaining alligator effects in the blanks, causing demember 5, preferably in the form of a ring, 80 fects in the finished articles and interfering which is removably secured to the shell 1 with proper distribution of the glass. by means of screws 6 and which extends According to my present invention, I over the upper surface of the insert 3 to a make the body of the blank mold from nonpoint adjacent to the edge of the mold metallic material having sufficient heat cncavity at and protects the edge of the cavity 5 ductivity to mold the glass in continuous op against injury during the blanlcforming cration without sticking to the glass, such as operation. the carbon compositions ordinarily used f6r The upper surface of the ring 5 is pro electric. brushes. I have discovered that a vided with a beveled recess 7' which forms blank mold of such non-metallic material a seat for thecorrespondingly beveled lower on does not produce the surface irregularities edge of a neck ring 8. This neck ring is referred to above, and that the blanks proformed in complementary sections which are duced in such a mold resemble l1andmarremovably carried by a pair of neck ring vercd blanks and produce bulbs, tumblers holders 9 which are pivotally mounted upon and other paste-mold ware having better pins 10 for swinging movement, in order to or, distribution and greater freedom from depermit the neck ring to open and close.

fects than has been produced before by au- The pressing plunger, as shown, comprises tomatic machinery an inner metallic head 11 winch is detach- Non-i'netallic blank molds, of the kind deably secured to a vertical stem 11-2 and scribed herein, have the further advantage which may be provided with a recessl3 for too that. the mold material does not extract as 'the reception of a carbon tip or insert 14. much heat from the glass as metallic molds, This tip is held in position by a pin 15 and and yet it is of suflicient thermal conducis provided with a convex lower surface it tivity to transmit heat through its mass and for forming the initial blow opening in the dissipate it'to the atmosphere with sutiicient blank The carbon tip may be omitted, as rapidity to result in a glass-contacting surthere is no great advantage in the use of face ofuniform temperature below that at carbon material at this point.

. which the glass will. adhere to the mold. The stem 12 extends coa-xially through and in spaced i'clalxlon with a tube 17 which couanuu. with u cupnly of blowing air and which is provided a'l. its lower extremity with a cyf cal shell l8 Within which the head lliS adapted in slide. The inner surlacc oi lilac shell 16 is provided with a p1uraliiy oli vcriieal grooves 19 which terminate above the lower edge of the shell so as to provide u glass-light lit with the head 11. A. "ippcr ring :20 surrounds the shell '18 'icldalily held in the position shown This spring is sulliciently llie sl'ripper ring to force and uniformly against; the llic mold. lull. will yield lo allow exio mzli'uiic upwardly between the in cl and tile slicll ill. lic conclusion oi the pressing operation lilo mold ren'iovcd, leaving the bare blank suspended lfrom the neck ring 8. Tile blowing; of the blank is then commenced by W '15; the elem 12, thereby elevating the i ll and establishing communication bei'iwi -n ilic supply of blowing air and the inil ial blow opening in the blank through ilie ii 3 l? and file grooves 19, which operation is described in detail in my copending application above rclfcrred to.

The ulune-described construction elimi- "nalcn the tendency for molds of a carbon composition to chip or to otherwise become damaged at the edge of the mold cavity, thereby imitcirially prolonging their life and rciulering it possible to secure the advanincidcni lo the use of molds of such icl namely, the production of ware lilial. i baloniially Free from scars or other blemishes and having a high surface luster at lid? some time obtaining an increased roduclaion.

. Jon mold. body 3 cannot be made carbon c iiiou indiscriminately, l compositions have such ii that, they will not conll'ic heal: oi? molten glass rapidly prevent. the glass from sticking @nc claac oi? earbon'com osisaiisiias i'zlie rcquirenici'its o' my iuvcnlzion as to heabconductivity is. cc mosiliims commonly used for However, other suitable rials may be found or pro o my lili'flllliifill is therefore not reill!!! purpose of enabling the blank mold 1 lac operated at higher speeds, the ulicll i only in; water-jacketed. Such urtillciul. cooling of the blank mold increases l'lic rate at "which the glass is cooled in the mold, and enables the molding of a greater iruunlicr of charges per minute.

'llic improved quality of blanks made in die carbon molds described above has been ltlic use of lJlllSll compositions.

Will

conditions, and I have found that the facts which result from the use of iron molds are completely avoided when such cerium blank molds are used.

Modifications may be made in couelmuztion, arrangement and node of opcmliou. Withoutdcpartin -'i.'rom the sec we of thciu vention as define in the apnea claims.

I claim as my invention:

l. A press mold for making glues blaulin for pastomold glassware cinnpi'ieing a mold body of carbon material lowing; sulllcienl thermal conductivity to mold molten glue. without sticking thereto.

A prcss mold for making glues blanks for pastcouold glassware, couu micing u mold. lied of electric lu'ueli carbon composition.

3. Apparatus for slmping glurnwarc. comprising a mold of carbon composition, and a pressing plunger cooperating therewith and having a glass-engaging; surface of carbon composition.

4. Apparatus for slurping glassware, comprising a mold having an outer metallic dill Fifi

fill

shell and a carbon inscrl. provided Will} a.-

the upper surface of said iuacrl to llie edge of said mold cavity.

5. In combination with a pressing plunger, a mold comprising: an outer mclallic shell, an insert of carbon composition mountedv in said shell and provided with a mold cavity, and a metallic member secured to said shell and extending; over the upper surface of said insert. to the edge of said. cavity and adapted to protect said edge. against injury under the action of said plunger.

6. In combination Willi a. n plunger, a mold con'lprisiu; mctallii'l shel an insert of carbon cmn iouilion rcnmmbly mounted in said shell and provided will: a mold cavity, and a mclollic. momlu-r rmuow ably secured to said slicll and projecting over the upper surface of said incerl. to the edge of said cavity and adi .iicd to maintain said insert against di -plum lent and to pro tect the edge of said cuvilzy ag uinal. injury under the action of said, plunger.

T. In con'ibinatiou will mold lowing}; a. Cl'Ll'lJOl'l insert provided e i a mold cc. io c,

a plunger for pressing 1 lo. cl a 1d cavity, comprlein'g u up. i mciulacc a-o- ROBERT W. oauiunno.

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